WLC 2112 - APs disassociating

I've found some discussion on this, but nothing that's helped resolve so I'm hoping someone can help. We recently purchased a 2112 WLC, running version 6.0.199.4. I have everything running through a single port on the controller, which is connected to a trunk port on our 3750 stack. Our management VLAN is vlan 40, and AP is plugged into another port on the same switch which is an access port in vlan 40. APs appear in the controller ok, receive an IP address, but we aren't able to connect to any of the WLANs and periodically the APs will disassociate with the following messages:

I'm not sure if that's related to why we can't connect to the WLANs or not...

Another wrinkle is that if we plug in the AP directly to one of the PoE ports on the controller, it all works perfectly. Any ideas? I'm guessing its something switch-related since the only difference is that we're not going through the switch when it works.

Should be plenty of power. The AP is the only PoE device powered in to the switch, and its a 3750G PoE switch. Let me ask this: Could it be an issue that the AP connects at 1Gbps and the WLC at 100Mbps?

I don't see any errors or issues on the switch side. Could it be network slowness? I don't see any of that, but just trying to figure out what could be causing it. They are plugged into the same switch. Its part of a stack, but there are only 3 devices plugged in to this particular switch.

That shouldn't make a difference. You might want to check to verify that the AP is drawing 15.4 and that it is negotiating at 1000 full. Do you see anythning on the switch logs? Is the ap's on the same switch or different? Have you tried switching the patch cable and moving the ap to a different port?

Weird that the WLC and AP are in the same switch stack and you are getting these errors. Just look at the logs to see if the port shut down, etc. Do the AP's in the same switch as the WLC fail also or just ap's that are on a different switch on the same stack?

in addition to sometimes showing a Heartbeat Timeout cause for the disassociation. In addition, sometimes it shows the cause being Max Retransmissions. I thought it was just the AP, but it happens with the second AP as well. Here are my switch port configs:

For AP:

interface GigabitEthernet7/0/14

description Test AP

switchport access vlan 40

switchport mode access

spanning-tree portfast

For WLC:

interface GigabitEthernet7/0/2

description WLC Management Port

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 40,55,82,94

switchport mode trunk

spanning-tree portfast trunk

It is detecting Rogue APs (these are the existing APs that we want to replace with this system). Could that be causing issues? I don't think so since it works just fine when plugged directly in to the WLC.

Can you post the output from the console on one of the AP's? If this is a new install? you don't have any AP's on this right now correct? YOu should upgrad that WLC to 7.0.230.0.... musch beteer code if you ask me.

Okay... Well look at upgrading to 7.0.230.0. Any who... You certain you don't have another device using the same address as the ap-manager? If you disconnect the wlc from the network, can you make sure the ip address you used are not pingable?

Its not pingable when the WLC is disconnected. Neither is the management IP. If I ping those IPs from another network, I have great connectivity. No apparent issues at all. Only with the APs.

I will say this, sometimes when just navigating the WLC's web interface (or via CLI), it can get really slow almost unresponsive. I'm not sure if that's because of the constant rediscoveries, or issues talking to the APs or not. I'm going to debug some on the WLC and see what I see.

OK. These are brand new APs, not converted. They join, then they "unjoin" and have to rejoin, but even when they show as joined, we can't connect to any of the WLANs.

Could it be DHCP option 43-related? I was a little questionable on that setup, but I figured that since the APs found the WLC and joined, it must have been set up correctly. I followed the Cisco instructions exactly...

So, after calling TAC, the fix ended up being to go into the Advanced tab on the wireless section of the controller and check the box for Pre-standard 802.3af switches as the source of power. By default, both that box and the Power Injector box were unchecked, and the switches are Cisco 3750s, so I'm not sure exactly why that worked. Do those switches not run standard 802.3af power?

Scott, thank you so much for your time and efforts. I upgraded to 7.0.230.0 and have the same symptoms, though the error messages in the WLC logs are different now. They now say that the radio is disabled, but the APs still keep disassociating for some reason, but they work perfectly when the AP is plugged into the WLC directly.